First of all car has 151k miles. I've got a compression tester and gonna check compression to see if the engine needs rebuilt. What is normal psi on a good LT1? Heres the parts I've currently got ordered:

GM Optispark
Jet fan switch
Felpro intake gaskets
IAC valve

And heres the parts I'm also going to get:

Plugs/wires (will be ordering tonight deciding which brands to buy)
Throttle body gaskets (need part # for bottom part of throttle body)
Waterpump (might as well change it when changing opti)
LT4 Knock Module
New vacuum lines

I also have a oil leak around the front of engine haven't really looked to see where its coming from but I'm going to fix it. I'm also going to clean intake good when I take it off. I'm also thinking about getting a new EGR valve but not sure on that.

I put new coil, ICM, o2s, MAF, ECT, fan motors, alternator, 160 thermostat and I thinks thats all in past 6 months. Am I forgetting anything else that I need to do?

 

Fuel filter - drain and refill rear diff

 

Does Jegs or Summit carry NGK plugs that fit our car, if so what are the part numbers? If not where can I get them?

 

Dont forgot the MAP sensor....That little black box on the top of intake on passenger side...

Thottle body gaskets 1993-- 17112833
94-96--17112831

 

well, if you're going to take that stuff off the front. I'd also replace the timing chain & sprockets, as well as the timing cover gaskets and seals. since you're going to take those off, you'll also want to do an oil pan gasket.
all coolant hoses would be a good idea.

 

My 131,000 mile LT1 has at least 160 compression in each cylinder, 160-180. Someone else will probably be more informative.

 

I second the timing chain. If that goes you will be in some trouble and with your miles i would DEFINITELY RECOMMEND IT!!!!!!

 

What is the minimum compression? Also where can I get the NGK TR55 plugs, does Summit or Jegs carry these? Also plan to do headers in near future so should I get over valve cover plug wires now? Will the stock manifolds cause problems with these? And lastly what is a good timing chain kit that won't cost me an arm and leg?

 

Stock timing chain is fine replacement but if you are going to go with a cam in the future then you might wanna go with an electric water pump and a cloyes or an LT4 extreme duty(like i did )