318 garage clear rebuild

Hi at all,

I have a 318 sitting around in my garage which came out of my car as it was replaced by a 408.

Now i have some parts laying around which could probably make a nice little budget 318.
What i got:

Full 1969 318 engine (should be 9.2 compression)
4 Barrel Intake
1976 360 j heads with 1.88 valves which are in usable condition
Scat I beam rods from a 408 stroker kit
Comp XE274 cam with lifters
Windage tray
HV oil pump
Double roller timing chain

I would like to put the 360 heads on the 318 and use the XE274 cam. I think i rember that i have measured the 360 heads to about 70cc could that be right??
So i think flat top pistons would be needed for example something like: that:Silvolite Pistons 3234H-STD Silv-O-Lite Hypereutectic Pistons | Summit Racing

The other thing is as i live in Austria and machine work over here is really expensive, i would like to avoid it as much as possible. So maybe there are some pistons which give me a higher compression and i dont have to rebalance the whole rotating assembly??
Or what would be my compression if i just put the 360 heads on the 318 with the stock pistons and the thinnest head gasket i can find? I think the xe274 cam needs 9 to 1 compression, would i get away with that?

Thanks for your ideas!
Laurin