I have no info on the 502 for you but I'm just throwing my vote in for keeping the 427. You don't see them any more I they were great motors. I'd build it up personally.
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Trey
Current ride: 2001 BMW 540iT soon to be manual swapped.
Former rides: 1979 Trans Am WS6: LT1/T56, Kore 3 C5/6 brakes, BMW 18in rims
00 BMW 540i/6: Suspension, wheels, and ACS bits.
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