Have Alpha I 1.50:1 complete rebuild ready to go. Will let go for a guud price. Call; 954 237 0332 if interested.

An Alpha behind a bigblock needs as much help as it can get. The numerically lower the ratio is, the less load is on the vertical shaft and bullet gears.

I say you ought to rebuild your unit with 1.5:1 gears and sell it. It will be a popular ratio and should sell well.

Then, buy a Chinese Alpha copy with a warranty and run the dog out of it.

As far as rpm, you need to be around 4400-4500. As long as you prop for that rpm, you won't see a huge difference between the different gear ratios, and your best bet is to run a ratio that gives you a good selection of used props (there are a lot of 21" and 23" Mirages out there..)

MC