I have them on my Road Runner. The paint finish looked ok when I bought them but I noticed a little rusting after a while where the 4 slots are. It's like it's a thin coat of paint that wasn't directed into all the crevices. If I was you, I would get them painted properly before fitting them.

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1970 Road Runner 505 cid MCH CNC ported Stealth heads MP 528 camshaft 4 speed GV overdrive 11.98 @ 117 on street treads