the 390 isn't really considered a performance engine to me, there are very little parts available for it, and the things for the 351 are going to be cheaper. you can build a 428 out of a 390, and that rebuild kit (no heads, just crank, rods, pistons, rings, all bearings) is 1800 out of PAW. the heads are another story, they i think are 1300 out of summit (428 CJ aluminum)
as far as parts, i have found National Parts Deport, Virginia Mustangs, and Mustangs Unlimited to eb the top three for what i have needed.
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I'm a glutton for punishment.
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