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Try playing with the needles and springs to get the quickest enrichment curve and maybe drill the lever a little lower. You can set your total timing to 36 or higher and run vacuum advance as well. Find the timing that works well at idle

The sensor on the spacer is air intake temp. On the throttle body in the pic, the black object on the bottom is the idle air control. Looks to be gm style stepper motor. Should have a 4 pin electrical connector. It bypasses air past the butterflys to set idle speed. Those injectors would likely...

50 lb injectors are huge, you can flow massive amounts of fuel with those. Probably too much fuel; idle may be hard to tune. On the throttle body, it looks like it has a stepper motor style idle air control. Can you post pics of it? I run Megasquirt 2 on my 318. It's inputs are manifold air...

I used Teflon and an fittings from anfittingsdirect.com Lots of selection and good prices.