J head porting
The OEM iron head only gets so good. It was after all designed as a people mover not anHP or race head. I don’t know what can be done as a max out of the head. I’ve heard some claims of flow numbers that I thought were pretty high in the mid 270’s. I really don’t know if that’s possible or not. Or if possible, what extreme mod must be done.
Regardless, if the head can flow 210 stock and you can find 240 cfm, that will allow for some nice street power. If you can find 250 or 260 cfm, you can get the car moving pretty well.
Head porters on here can tell you better of what the heads capable of. IDK if you want to bother with iron heads unless you want to do iron heads for a specific purpose.
In the MP “Speed Tips” section, they’re using ported 360 heads for 12 second recipes. Maybe 11’s as well, I forget, I would have to check to be sure. But, IIRC, they suggest a ported 360 head, 6 pack and a MP solid cam 296/.557 to get into the 11’s, again, IIRC.
Today I’d run the RPM-AG & a 750. It’s a lot cheaper that way.