Which 318 should I build ?

Me too
and with the shop it was diy
not so with the op
I do hope his blocks are re-ringable
I expected some pics and dial bore measurements by now- or at least snap guages and a caliper
can't really say anything till we see if his blocks are useable without new pistons
which would also get the compression up
but pistons for 318s are tough on a budger
So yes just will be getting new rings and doing a valve job to heads