Mark.Sure does make it hard to make a good decision how to go about this swap when you don't know where your going to move to.But in general for emissions if you swap a later yr engine you have to have aleast what appears as the same emissions in place as the yr engine you swapped.That includes the induction system type.
Your somewhat right about OEM TPI's.They are not know for high RPM hp.But the bottom end they are very good for torque.The engine you got is such a advantage because I think it is in the yr range of L31 true Vortec's that had the highest output of the Vortec series with a SFI injection system.
5700
The Vortec 5700 L31 (Vin code 8th digit "R") is a V8 truck engine. Displacement is 5.7 L. It is the last production Generation I small-block from Chevrolet. The cylinder heads feature combustion chambers and intake ports very similar to those of the LT1 V8, but without the reverse-flow cooling. As such, the L31 head is compatible with all older small-blocks, and is a very popular upgrade. It offers the performance of more expensive heads, at a much lower cost. It does, however, require a specific intake manifold (a Vortec head has 8 bolts attaching the intake manifold as opposed to the traditional twelve bolts per head). The L31 was replaced by the 5.3 L 5300 LM7. The 2002 model year was the final year for the L31 5.7 L small block V-8 whose origins date back to 1955. The Vortec 5700 produces 255 hp (190 kW) to 350 hp (261 kW) at 4600 rpm and 330 lb·ft (447 N·m) to 350 lb·ft (475 N·m) of torque at 2800 rpm. It is currently being produced as a crate engine for marine applications and automotive hobbyists as the "ramjet 350" with minor modifications.
Here you see also you have to get/buy a Vortec spec intake to put any other manifold on it too.The TBI's are 12 bolt intakes at a different angle and the Vortec's are 8 bolt intakes.
The upgrade to OBD II has a much improved fuel curve to approach the ideal A/F ratio of 14.1 and a spark curve to match so more power stock and more gas mileage too.
Too bad you missed out on the 4L mainly because it's programed by the computer you didn't get to match up to the engine your swapping.The 4L is a greatly stronger trans then any 700R4 as well.Sure wish you would have pm'ed me before you let those things slip by you.To get a factory service manual for both and re-pin your harness I think you would have found very do-able.
Don't know if you know how lucky you are to have come across this yr engine.It is a prime find if done right. =D>
Now about this B.S. of brow beating.Well there are very good reasons behind the advise I give as you can now
SEE
