Cylinder head swap

You can put them in with no issues, they will bolt on and the valves will be fine, even with 2.02" intakes...

However you will get about a 1.2 drop in compression from the larger combustion chambers.

You will still get a benefit from the heads, but you will get more benefit if you put a set of 10.5 318 pistons in and then put the 340/360 heads on and you will be around 9.2 compression....

Also throw a good double roller timing chain on it, the stock 318 chains stretch and jump to easy.