340 input (direction)

I know compression will help make power .
Yet I have had low cr motors that run better then I expected and, many times people have less compression then they think.
Most 340/360 heads are said to be between 68 and 71 pc's.
The block could have been decked and heads killed?
Or it might have been ringed and bearings ?
Either way if it was put together right it
Should run well !!
Truly even a real 300 go motor in an a body will create tubs of fun , especially with low gears and a 4 speed !
Enjoy !
When you are ready to do heads contact iq52 he will make them flow well !!
Best of luck !!