Also ASP will work too I've heard. They make them too.
Heads swap to 3x00 stuff yes, but that will require chaning power steering pump and other stuff. Just swap a full 3400 in if you are going that route :P
The 3.1mpfi made lots of torque down low due to the skinny long runners. They drop in power in the upper RPMs due to the intake manifolds crappy design though.
TB is 52mm but going bigger won't really help with the old school heads and intakes.
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