915 heads vs 302 heads

What valve size are the 915's?

All sb LA heads are swirl port, that is....if any are.lol

FWIW the 302's i have off of a stock motor come out to 64cc, just as the book says... 'probably the only 318-360 head to actually be as advertised'.
The 318 intake ports are all the same shape between 302 and 675 castings are around 124cc's int port volume.
The 915's intake port volume is 'from what ive measured' 155cc for 2.02 int valve & 160cc for 1.88 int valve.
Ive also measured 69-72cc. One set i got as cast had one of the middle chambers that was 64cc's while rest were 69cc's.
I would use use the 915 heads, milling them .045 off the deck and .040 off the intake side.
When it comes down to it...the j's flow more air, about 30 + cfm more 210-228cfm... thats a fact. the 318 porting heads stock numbers r identical to 302's-17-175cfm