There you go !!! 11 to 1 compression and ported heads , my 360 heads were stock and I am lucky if the compression was 8.5 to 1. I went 11.30s with a 9 1/2 to 1 340, 557 lift cam and ported J heads. Now I run 10.80s with a 9 1/2 to 1 compression 410 inch small block , 585/595 lift cam with ancient W2 heads
Ported 318 heads with stock sizes 1.78 intake valves don't flow a whole lot more than a 360 head stock but the higher comp certainly helps not to mention less gear, converter and carb.
A stock 318 head only flows around 170 cfm peak where as a 360 head will flow around 200 cfm. The port volume is significantly higher too with the 360 head