I bought a cheap(new) limited slip and used factory gear set off of eBay for mine.Horrible I know but I'm not spending a ton of money on a 10 bolt in my bucket of rust. Not a ton of miles yet but it pulls both tires hard.
That is a mild cam and should work even with the stock compression. That being said it wouldn't hurt to deck the block a little (if for no other reason than to make sure it is flat and square) and have them mill the heads a little as well. Thin head gasket and it all adds up.
I would have them...
A guy on one of the Mopar forums I am on was complaining about how loud his 440 powered car was with the flowmaster mufflers. He installed 24" glass packs before the mufflers and it quieted down considerably. Clips were only at idle but it was a noticeable difference.
3.42 with limited slip is installed and quiet. $150 ebay limited slip and used factory gears from eBay as well. Replaced the warped and leaking trans pan with a new one with a drain plug.
I fully expect the trans to take a dump. Have an extra turbo 350 to build when it happens. I sell tires for a living so I have that covered. ;)
The Lakewood traction bars are on back order. :(
Going to need a muffler shop to connect the headers to any mid pipes. The kit is still useful if that is the one you want. Not much bending up front so less chance to crimp pipes too much. Nice mandrel bent tailpipes are a plus.
The 600 will run and work just fine. That being said a 750 would be my choice. If you do heavy towing you may want/need the extra oomph.The original quadrajet would have been at least 750 cfm. Fuel economy is dictated by your right foot if everything else is tuned/working properly.
Any straight through type muffler (magnaflow,dynomax ultraflow,Borla Pro xs) will give you more sound and better flow. Even the Flowmaster FX is an affordable straight through muffler. Longer case =quieter and shorter case = louder.
If I were to run a Flowmaster it would be the Flow FX ( knockoff magnaflow ). If I wanted the chambered muffler sound it would be either the 50 series big block or the 70 series for me.
If you have good 2.5 pipes to tie into then why not use them? I could see doing some 2.5 mufflers and tailpipes if it were mine. Of those two choices I like Borla Pro xs better. I have run them on a supercharger 4.6 mustang and have them on my big block Duster currently.
I would look into a...
For that low compression something like the old rv cam (comp 260H) would work well.Or something similar. Idle to to 4500 where you want all the torque you can get.