318 4 bbl and intake upgrade

Couple years ago I put a stock '70 340 intake on my wife's '73 Challenger. Put a 625 Street Demon on top with a 1/2" phenolic spacer so the choke linkage would clear the factory choke stove casting. A buddy gave me the intake so I had it kicking around. Challenger already had '68-70 340 exhaust manifolds on it And TTI 2 1/2" exhaust. Ran the car on the dyno with the stock 2bbl setup and got the as 1973 advertised 150 HP. Might have been 150 and some change, but no powerhouse. Swapped the intake and carb, never touched the distributor so timing was the same. Picked up 30 HP at the rear wheels. Rest of the 318 is the tired, stock, as-assembled by Chrysler engine. Yea the ports mismatch. Doesn't matter for this application.