I need a good gasket set for a FI 383, I need em all.
Felpro.

Cheapest place to get em

 

For the LT1, they come in two parts:
CS9966 for the bottom end
HS9966PT for the top end

JFGI for prices, since you have to consider price, availability, shipping costs, tax, etc.
You can find them on fleabay, summit, jegs, etc., even local auto parts if time is of the essence.

Also, you have to think about the head gaskets included in the kit. Are they satisfactory for your needs? For example, I run FI, so I wanted MLS head gaskets.

 

good point on the headgaskets

 

Here's a good kit but you will have to ask if the head gasket is good for 30 over. http://www.summitracing.com/parts/TFS-31400911/
Incidentally the gaskets are Fel-Pro.