Stop discarding good 340 engines ! !
I've had several 340s since 1970 all of them "hi compression, and meh they were ok.
and
I've had two hi-compression 360s...... which were, IMO, "better"
All but one of mine have had manual transmissions behind them, with all sorts of rear gears.
The one I have now, as tired as it is (going on 23 years), you couldn't trade me two good running 340s for.
And, I still have several disassembled 340 shortblocks kicking around, since the 70s. When my Hotrod was in the planning stages, a 340 never even crossed my mind.