Most of what I have read says to use the early tbi ECM and wiring. What would be the benefit of using a later ECM and wiring harness?

With a manual trans, do I need to hook up the vss ? Some posts say I do and some say I don't. I was thinking about the in tank fuel pump. I've read that I can use the in tank fuel pump and sending...

The current engine is the stock 350, 4 bbl. It is a 4 speed transmission. I added vortec heads to it a few years ago. I found a 89 truck tbi setup, minus the ecm and vss locally for $100 that I am...

just starting to piece together the harness and parts to start the conversion. please give me any advice you may have for this process.
thanks
reg