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I'm still learning the numbers game on the engines but before I toss in a bit will these fit my 73' 390 engine (with 428 heads if that makes any difference I asked about that before tho)
when it says 352-427, I am assuming they will fit the390 as it falls between those 2 sizes?
These will fit, you should inquire as to the maker of the headers and then contact them to see if the part number will specifically fit in your vehicle. One thing, the 352-427 reference is that they are for an "FE" engine, as is the 390 you have, not necessarily that your 390 falls in between the benchmarks.
--Mike