shroud

dartguy340 said

I think the best thing to do would get a V-8/340 radiator and the shroud that goes with it. You could also put a 1970 340 radiator in it(cheaper than buying a round top 1969)and a shroud, I think the shroud you would need then ends in "324". Good luck with whatever you end up doing.

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That would be great if readily available and affordable.
A brand new radiator is a better bet than any 40+ yr old one.
Spending a small fortune on a engine build then skimping on the radiator is a mistake. I've been there done that.
you dont absolutely have to widen the core support opening to install a 26 inch radiator but It will work even better if you do.
I have a decent used 22 inch radiator ( part # 38086 ) I could offer but I couldn't recommend it with a new engine build and I dont have the # xxx614 shroud for it.