318>390 Stroker.......Your thoughts

I've often thought about doing a 318>390 build for one of 2 vehicles I have
An 80 volare is one, an 83 d250 is the other (my son actually has the truck) he pulled the original 318 out of the truck cleaned it up and painted it, it's going into something else.
These would be built differently between the car and the truck, being as how the car is lighter and the truck would be used like one. Neither would be raced

I've read many threads in here and most shout 'go for a 360'. They are rare in the UK and if you find one very expensive to procure. So that's not an option for me. Guy I know paid £3000 just for a block, no heads etc.
Biggest issue is piston choices for the 318/390. Trying to get the comp ratio you want is very hard.

My options are 9.9:1 SCR or 11.5:1 with what I can find.
Shame as ideally I want mid 10s.

Always wanted to keep the 318 as a base, but wanted something to kick me in the back when I romp on it. Cubic inches was my choice to do both.