No, there's nothing wrong with what you're doing. Everything is cathedral style heads so the parts will swap. You can use the 799 heads or you can swap to any other heads including Gen 4 style if you want. You'll have to swap the intake though if you do that.
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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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