HOT 340 Engine rebirth....... maybe!!!!

KB107's are 360 pistons arn't they?

I'm actually working on 4 motors right now, overhaulin a 318, going over and improving a Built magnum headed 360 w/KB372 pistons and two 340's.

This motor were talking about is a 1971 340, so the KB243's are the only ones avaliable. I figure with a little head milling I can get 10 - 10.5:1 maybe have to run a touch thinner head gasket. I'm looking for Forged alternatives, somthing that can run with tighter clearances since I'm honing to 4.08 and one bore is already 4.075, by my calculations that only leaves 1 thou hone on that cylinder if the pistons have the tolerances already built in these days?

The cam that was in the motor was shot, one journal is rusted and pitted from sitting, I just listed it to see what the power potential of the engine was.

I'll be buying a new cam, thinking somewhere in the 230-235 @.050. I'll probably run a M1 or similar edelbrock single plane,750 carb I have 3.91 gears, A904 trans with Race parts and am thinking of 2800 or 3000 RPM stall.
I'll port the heads on the 1971 360 cause they are 2.02 915 J heads but the 1969 has the X heads so I might leave them virgin, time will tell.

Hoping to get into the mid 12's on street tires.

I'll run the 360 until the 340 is built, I need a new cam for that one too and going to mill the heads a touch to raise comp to about 9.8, and do some more porting, its got a dual plane M1 magnum intake and 600 carb right now. Don't know if I can get near 400 Hp with this combo but I'll try.