building a 360, and newbie 360 questions!

Almost no difference in the heads. The ports will be fully ported out and the stock differences in the head, and how minor they are, will disapear. A full porting job will get them to flow those numbers.

A comp 3 angle valve job is work done on the seat area where the valve rests.

I don't know the way your country rates octane. 12-1 in the states by the RM2 method is good for a 10-1 iron head and a decent sized street/strip cam. There are variables to this and I'm not getting into them because it would be 2 pages long and generate more questions that would take up another 3 pages.

If you don't think the octane you have now is good enuff for a 12-1, then this build isn't for you now is it?

A strip Dom and 770 Holley is good for a screaming engine.

Typical full head porting prices are about $2000 fully done. This will include new valves and set up with surplied springs of the cam being used.

Your better off going with the last package for a street brute and a low enuff commpression ratio to run pump gas.

Get wide sticky tires, you'll need them.

For a simple build and pump gas, package 5 with the Holley is your best bet.