360 cheap-o build

New rod bolts and main studs are moving away from your title of "360 cheap-o build"........have the big ends of the rods checked, if they are in spec, all is good......main studs won't buy you anything at the level of build you seem to be heading for ( I didn't use studs in my 360 race motor ).......money not spent on the previous can be spent on a good balance job.......with KB 107's you might slide into an internal balance reasonably

What ever you do, good luck.