The already have an intake for a carb that comes with the computer and program to work. But, WHY? If I were going to use an LS1 motor I'd just use the factory FI.
My bone stock SS Convertible went 13.4 @ 104 at 3800 lbs. A "Mild" 400 wouldn't be too mild to do the same. A 455 would be another story though. The SS and the Trans Am that replaced it both need 93 octane for performance runs; the computer will pull timing for 87/89 driving.
Personally I'd like to see a 400/455 in your 67, but understand that it's your car and the LS1/2/6 is a great motor.
If you want cheap, go with a crate SBC, for hi tech the LS1. But I'd still go the original path.
Unless you get a deal on a LSX motor, they are not cheap...
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