Plus you got eddy heads ?
If my magnums can breath to 6000 rpm your must be able to well past that.
My cousin late model pulls to 7000 rpm 367 through a 2bbl.
I put a 2bbl top-end and cam on a 340 once,back in the mid 70s with some used 340 springs,Dropped it into a 65 V100 wagon with fenderwells. I called it my big-bore teener. No tach. So I dunno what it revved to, but it didn't matter.That was the second most fun car I ever had. Right up until the 904 gave up. The little 7.25 out-lasted the trans,lol. I gave the car to my little brother. He was 15 or so, and was planing ahead,lol.
I burned up a lot of trannys in the late 60s/early70s. I finally went to work in a tranny shop,in about 76, no more problems,lol.