I plan to try using long exhaust tips at the transom with the bottom of the ST box cut out to see if I can maintain the speed gain and still be able to run the platform. My wife really misses the platform (but she understands my need for speed).

ok bringin it back. I finally purchased my go fast goodies. heads intakes cams, carbs, distributor, roller rockers basically tops for both power plants. It should be in the water in about 2 weeks I will let you all know how it goes.

Had an 89 272 with twin 330's/bravos in it, boat was a 64 to 65 mph boat, swapped the 330's out to a pair of fresh 420's that I picked up from Dollar Marine in S. Florida, used Bassett headers(center to center clearance was to close for anything else) and the boat became a solid 70 mph boat,picked up 400 rpms and stepped up one size in props(25's to 27's).

So, how many ponies are you expecting?
Are you still looking to keep the motors at 400HP per side?

my combo should net about that, 400 per side. kinda scared to go anymore with the alphas.

Slick02 what type of basset's did you use? over the transom?

You should run 67-69 gps with that combo.