I would be very interested in hearing the answer to this also.!!
I just bought a boat with a fresh 455, but it has a Tunnel Ram with dual Edelbrock 600's
9.75 to 1 compression
.40 over KB pistons
286 Isky cam
10qt pan,
big valves, etc.
It dyno'd at 450 hp & 550 torque
It almost seems like to much carb though.. wondering what the difference would be if i swapped out the T-Ram & duals for a Performer intake & a single 750 dp Holly.
I'm sure Tom @ JBP will be back by here soon. (or anyone else whos got some info/experience)