Mean 318...or stroker....hmmm

Here is the issue with 10:1 SCR and the 390..... the only listed kits from SCAT will get you in the low-mid 9's or 11 for SCR; nothing in between. I see some Diamond pistons that will get you to around 10:1 SCR but those run around $800 for a set. The quench supposedly will help overall combustion efficiency so is worth something even at the mid 9's.

So you could get the block square-decked, and get the pistons at zero deck and use the .028" thick head gaskets of you are brave or the .039" gaskets and have decent quench effect either way. But you are going to be at 9.6 or 9.4 SCR respectively with the 23 cc dish pistons, 63 cc head chambers, and those 2 gaskets. You need the 16.7 cc dish Diamonds to get to 10:1.

The above is probably the main factor that makes a 360 an easier choice to make for stroking: piston choices.

BTW, I would not personally sweat over .020 vs .030 vs .040 overbore if I was not sweating the 390 vs 408....