Porting 302's

And they say the 714s are the same as 302s. Are they really? I just got a set of 714s, those would need the machine shop treatment still. Any difference between, besides that cast in number? Are either, more or less likely to crack? I do know that the 714s have the rotators on them, the 302s Don't (any more) for my purposes I don't think those are a deal breaker, but the answer may help someone else reading along
The particular 714s I have came from an engine that would be a fantastic mosquito fogger, engine had been replaced in the truck I took them from, heads have the telltale overheat buttons on them/ I don't know if it was a used junkyard replacement or a reman (such as a jasper, etc)/// all I know, is the guy who had the truck I pulled them from had the motor changed because the old one was a mosquito fogger, and said it's no better with this "new" engine, he's been driving it 10-12 years by his estimate on this "new" engine he paid "a bunch" to have installed at the time.
I sày this, not knowing at the moment whether the smoking tendencies would be in the heads or the block, as the block has gone across the scale already, so I may never know what caused it to be a smoker..... We're on a 91 Dakota, that I bought for it's A500 and a few other goodies/ then scrapped, had a weak fuel pump and lotsa rust in all the wrong places. I did have it running, put a jump on the battery and it started right up. Seemed to run ok despite the smoke.
Is there anything about these heads that is known to go bad (weak guides that wear out prematurely maybe?) that would cause an engine to be a smoker? I realized it could have had a cracked ring or 2 but again no longer have the short block handy that I can pull apart to eliminate as a cause. Just need to know if there's something else that need "special attention" from the machine shop once I take them in? Being as how this is the first of these heads I have ever messed with.