340 has a 4" stroke and .030" over, AKA a 416". I'm running MRL Performance main caps and Hughes girdle. The crank in an Eagle forged, as well as their H-beam rods. Pistons are Mahle flat top w/ valve reliefs, I'll be at about 11.5:1 compression with 65cc heads. Did the oiling mods that are stickied at top of the "SmallBlock" forum. Bushed the lifter bores and running Hughes lifters for solid roller. Cam is a Lunati Voodoo with .643" lift in/ex with 1.6 rockers, duration 260 @ .050. Heads and Intake are Indy, ported with gasket match. Running the 360-2 heads with 2.10" Intake/1.65" Exhaust valves. Pushrods are Comp Cams 3/8". Rockers are T&D full needle bearing. I will be running a Mighty Demon 850 Carb, and exhaust is coming out 1 7/8" TTI headers and exhaust.
Hopefully a good combo, I've seen similar on here making 550(or more) HP/TQ.
Thanks for looking, cheers.