I did the 343 hp build on mine.
.030 over block
.10 under crank
sfi balancer
balanced
electric fan
electric fuel pump
H.O. 305 heads
double roller timing chain
single plane eddy brock
262 xe comp cam
rhodes lifters
full roller rockers
rams horns
600 cfm carb
HEI
accell ignition
static compression about 9.5:1
dynamic compression about 8.4:1
I am hoping to get about 300 hp out of it.