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Knowing Chevy's like I do I'd say check the starter, the battery terminals the starter relay and the starter solenoid

66 is a little large, been too long but I thing I only ran 64's on big block many years ago.

Everthing is built in that alternator.What you describe is very common in Ford alternators and it's usually at fault even though it's charging "almost" normally.As said you can ck fuses and connections but you'll most likely end up replacing it

55 seems like a good place to start. 60 and 66 is a lot of fuel and may be a large part of th idle issue.

il drop them down thanks wrench to about 55s for a start on the small block c how i go

The heat gun generates too much heat for the delicate internal windings in the injectors. If there is a shroud that covers the injector plugs, just remove it to get access it may be held down by alan screws or something similar.

160,000 miles

hey sabl im in osceola arkansas

The 'messed up valves' is a common problem when the timing belt breaks....that's why wolfen said to get the wallet out. The replacement engine should be identical to the old engine.... one basic engine design is used in many models. Have fun down there.... it's getting chilly in Ohio and winter will soon be here.

Well if I remember correctly when I changed the injectors a few months ago, I had to take the upper intake off (the piece of aluminum that says 3100 on it on the top of the motor). After that, the fuel rail needs to come off, and then you can get to the injectors. I did notice something odd when cranking during a hard start last night. The starter sounded like it wasn't getting full voltage - it was cranking fine and then started to slow...