Do you have a -2 imco lower drive unit on this yet?
If not that could get you there

Have you checked the x dimension? How far is the prop shaft below the hull? A -2 imco drive on straight v's i have seen a big difference on mine and friends boats. Fountain has always had there x dimension much higher than most boat builders.but it is worth a look

The motor is at competition marine in Moscow mills mo. They are gonna give me a few options and know what my goal is. They have a 10-71 blower there for sale with dual carbs that's pretty reasonable. Just kinda curious what I could get out of my 177 and hp500 carb?

You don't get the gains from shorties on fountain stepped hulls like straight hulls like the outlaw or scarabs. It really depends on the XD but when I looked into and was really close to pulling the trigger it just wasn't worth it. With a -2 on my hull you are in 5 blade territory, and they don't plane out well at all. Its hard to say whether a -1 or -2 shorty would get a worth while gain, vs the cost and negative effects for planning

How much boost are you seeing now with the 177? I wouldn't do a 10-71 personally as I think its too big for what you are after. A 6-71 or 4-20 would be ideal honestly, even an 8-71

Honestly I have no idea what boost it was pulling before. The owner I bought it from said 3lbs. Now that it's at a marine shop they are finding some real strange things do I'm kinda questing the people who had it before me on how well it was setup. I completely agree with you guys on needing a bigger blower I just honestly don't think I could swing the extra cash right now on top of rebuilding the motor. I brought up the 10-71 since the shop has it for sale for another customer for 2800 with two dominator carbs so it's not a bad deal. If I could find a 250 blower with a carb all ready on it for cheap I would go that route. Just 7k to rebuild the motor and another 3k for a different blower the cash just isn't there.

Yea I hear you, I have a handful of things I want to do this off season, and just not sure if I will get the money together for all of it.

For starters, the 800 Holley is way too small for a HP500, with a 177 blower. As, is, the 177 on a 502.

What I would do, is sell the 177, and grab a 250 blower. Then, rebuild your HP500, but install a 525EFI camshaft. Sometimes you can find them very reasonable here in swap shop with low hours

The 800 carb is too small for the 177, and the 250. Minimum, you really want a 1050 on there if you have to run a single carb. A 250 blower package with a 1050 dominator, can usually support around 700HP. Twin carbs, about 750ish. I highly recommend twin carbs on the 250. If you happened to find a 250 blower with single 1050 used, throw the 1050 on the 177, sell that package. Pick up another 800 carb off an HP500, and throw the 2 800's on the 250 blower.

I really wouldnt waste my time with the intercooler under the 177. Your blower is already gonna have a hard time making boost on that engine. Adding the chiller, you're gonna have to spin it even harder, to make the boost from the restriction of the core.

i went ahead and picked up a used 420 blower with twin dominator carbs. So should be looking for 750hp. Hoping that will get me well I to the 80's.

Mild Thunders advice is golden. Take one of those 1050's and sell the 177 as a package to recoop some money, then sell the other 1050 to get money towards picking up another 800. Or you may have to just sell the 1050 and 800 and pick up the size you need. I wouldn't think you would need twin 1050's for this set up, by Mild Thunder would be able to shed better light on this on for the 420 blower