Lots of good ideas here, for a driver, as opposed to an Autocross car, I would go in this order as your budget allowed:
1. Bilstein shocks
2. Subframe Connectors
3. A front sway bar
4. Hotchkis rear leafs
5. Borgeson steering box
6. A rear sway bar
The 18x10.5 fit surprisingly well with the 275/35/18 on them front and rear. As stated the front fenders were pushed out pneumaticly and the tears were cut then pushed out as well. I fit 315/30/18 on the rear but went back to 275/35/18 to keep a square setup and better Autocross compound tire...
I agree with all on that its a fuel/timing, but I don't think you need a 750 cfm carb to make 240 HP. I have a very similar 360 with a 570 cfm Holley Street Avenger. I got my carb from Holleys refurbished shop on EBay for less than $250 and it was night and day compared to the AFB I replaced...