428 motor
I believe the '67 and '68 428 only came in the HO version. In '69 they introduced the 428 small valve, 46 head version, as standard equipment on Bonnevilles, optional on all other "B" bodies. GP could get a 370 hp 428 (different heads and cam) or the 390 hp 428 HO. The 390 hp 428 HO was available on all "B" bodies and the GP's. To the best of my knowledge only about 900+/- "B" body cars had the HO motor and about 1200+/- GP had the HO motor.
I agree that a 428 HO motor will add value but it is not likely to be dramatic unless you find that "guy" out there who just has to have one.
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