Thanks for your replies !
I decided to go with the 408" from KEITH CRAFT.
Just got done ordering it.
New Sportsman block
AFR 205 cc heads
Eagle 4340 crank - zero balanced
Eagle 4340 H-beam rods
Comp Cam custom grind
Scorpin roller rockers
JE Forged pistons, 10 to 1
Victor Jr. intake
Di Vinci HP carb
ARP crank & head bolts
ARP rod bolts
EST. 570-590 hp @ 6,400 rpm