340 cam for 318

Baggs said

Tires will be 15 inch, probably in the 205-15 range, maybe 215. So not tall. 60 series if available.
Good drivability, I don’t need/want a rumpity cam.
No strip time will be seen. Possibly some spirited driving, but not along side of someone.

230/240 HP is the most I’d want in this truck.

I may change the rear end though, but will start with what I have.

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mannnn... 4.11's with short tires... so lots of street driving for you then!

for that HP goal (let's just say ~300), and what other components you've got-- the street master, 500cfm carb. honestly, a 360 2bbl cam would get you there. that howards street force 1 would too. something like those.

for this specific application, with the parts you've got i'd be looking at sub .450 lift, and something under 260~265 duration, no more than 112 and split pattern (a grind that's got slightly more lift/duration on the exhaust).

here's the biggest issue. the gearing is gonna spin the motor up with the quickness so with the relatively small carb, intake, heads you're gonna run out of huff. keeping the cam small will make the best of the motor combo, and it'll have great street manners but because of that gearing the power delivery is going to be very quick and seem very narrow.

switch the gears for something more friendly and it changes the entire picture.