70 318 with 340 internals/Cyl Head

There are too many ways to swap parts around to boast on a 318 with 340 guts.
there are like;
5 of 3.315 stroke cranks
lightweight rods, heavy-weight rods, bushed or not,
piston weights are killer from the heavy forged 340 items to the lighter cast 318 items,
So when you go to assemble something like that, you gotta stir the pot just right.
If I had an abortion like that, I wouldn't mention it.
If it doesn't shake itself to bits, just drive it.
If it does shake, prepare to take it all apart and fix it.
Not a big deal. the proof is in the shakey-shakey.