Hey guys I have a 63 nova wagon with ls swap.....I just picked up a lq4 to replace the stock 5.3 that's in there now and need help with a good setup so I know what parts to look for and start buying this is what I have so far:

2004 Lq4 (stock)
243 Heads (stock)
102 mm Symbol Luxury Performance aluminum intake
or
Stock ls6 intake tb
4l60e (stock)
3:73 posi with 26" mt street (that's all I can fit without a lot of work)

Plans for this car will be street/strip and run the Rocky Mountain Race Week its like drag week so I will need a setup that will run good but also be street able

So things I need to know:
Do I mill .20 off the stock 243 heads?
What head gasket to buy?
What cam, spring, pushrods?
Converter?
How much do I need to build for a transmission to hold?
Would under drive pulley help this or waste of money?