A Seventy Swinger weighs about what? Say 3360 with you in in it . Maybe less.
At 420 hp, that is 8 pounds per hp and has the potential to go
[email protected], in the quarter. That's pretty racy.
A zero-deck 360 with Eddies, comes in ,depending on the gasket at about 10.8 to 11.3Scr.
Any cam between 220* and 250* at .050 is fair game.
I have the samish engine and have run cams with 223,230,and 248 @.050s
My favorite was the 223.
With your stall and the 3.23s ,a 230 is about the biggest I'd go. Really, that 230 wants 3.73s with an auto, but 3.23s will work with that 3500.
The thing I see is that your combo will hit 60 mph at 6200 with 27s, still in first gear, spinning most of the way......, so a 248* cam would be a better choice...... if you had traction. But you could do the same thing with 300hp.Spin to 60 I mean, which is like the 220* cam. But then you wouldn't need the 3500TC.
Since it's not daily driven; and you do have the 3500, I might try a fast-rate, built for the 904 lifter, 230 to 235, Intake duration. That will make a pretty hot streeter. It's more than you need, but ........ it will be a lotta fun
And maybe not the best kind of fun;
I spent 5 years in a 70Swinger, with just a 340,and I got to know her nasty personality all too well. Changing lanes at peak torque in second gear with a 4-speed... could be risky business. I learned to be gentle on the throttle, which at age 17 to 22, was a real challenge,lol. You're going to need a lotta tire,both ends, else she'll be stepping out sideways on every turn, with just the slightest too much pedal. Thing is, the stock tubs IIRC can only accept 255s, and even that's a trick.
With your combo, any typical performance cam will run well. So I don't really see a wrong choice
For Eighth-Mile; my samish engine hit 93mph . If you get to that with 3.23s , that will be about 5600 at the top of second. A 232* cam is close to perfect for that.
Point and shoot, keep it straight, and Good luck
