Vortec heads, Fel-Pro 1094 steel shim gaskets to get some quench, Crane hydraulic roller cam 104224, or 109821 if you´re willing to spend few $`s to cut guides for more lift. Air-Gap Rpm intake, 600cfm Edelbrock, should be within your budget, and you`ll see apprx.
360-380hp, thanks to bobl / FTM, for giving me this info, it really worked on my boat.

S-24

that one should be fine. ive got an extra ill make you a deal on. still in the box, never used.

Wow those boats came with small blocks didn't even know that. the 220's are nice boats, my dad still has his, 1989, 502, bravo. great looking boats

Like the guys say, keep the money and just enjoy the boat, cause if you upgrade to more HP your alpha might get mad and scatter, but hey maybe not, I have around 570 hp running through my alpha

email me with specs and price

Ill check on it tonight. its either the 262 or the 270. I just sold a boat with 350 mags i was putting it in.

That's a pretty mild cam. It was called Marine Extreme or something. I put one in a merc 260 with an alpha about two years ago. It gave me zero additional mph, but it idled really well and sounded great. I had to do an intake manifold job, so I figured WTF.
I was able to use the stock springs.

The boat ran and idled great with that cam. It just didn't make me go faster.

On my merc/alpha 260 sbc I did a Mallory MBI Ignition, an Edelbrock intake, and the Comp cam.
It was a 21 foot Nova (3500 pounds) and I got 52 mph at 4800 rpm with a 19p 14.5inch cleaver. Drive trim only.

which is just a little faster than my 26 footer with twin sbcs.

Question:
In the example above... (S24)
Why remove a 700cfm quadrajet in favor of a 600cfm holley?

I almost forgot.

Having a wife that gives you 5 grand for your hobby rules.

yeah,She's wonderful,after 22 years she still supports anything I express an interest in