Ok i have a 93 speed density car. This winter im doing a 355 with LT4 AFRs and intake. Im building it completely from scratch....and im selling my current motor and getting rid of all the old used accessories like the opti,alt,waterpump,ac everything except the power steering. other than the obvious..(sensors, alt,wp) what else am i gonna need to get this LT4 to work in conjunction with my 93 wiring harness. Like..fuel rails, what kinda opti,alternator...??? anything that will need to be converted.

 

if its just a 355 youll be better off just running a set of stock ported heads/cam pkg from advanced induction or lloyd elliot and running your stock, unported lt1 intake.

 

no..im running a 300 shot of nitrous..and id get alot more power out of these heads...im still thinkin about a 383 ..but i dont know yet

 

You're going to need to do a little fabricating with the fuel lines to get them to reach the connectors for the 94+ Fuel rails. Other than that, everything else should be just like it was on your 93. The opti will be your decision, you could stay with the early non-vented style or you could convert to the Vented style. That's pretty much it.

 

well i have a friend of mine whos gonna get me a modified fuel rail..with AN lines...how would i convert over to the newer opti? and would everything still plug into my harness?

 

You'll need the following:

95 Timing Cover
Vented Opti
Vented Opti Wiring Harness (the opti end has a longer plug that the earlier ones)
Opti Vaccuum Harness
95+ or Aftermarket Timing Chain
New Longer Cam Dowel Pin or a cam made for a 95+