I would go a 72 or 74 degree cam, that way it will have a nice lumpy sounds and give good power. What diff are you using aswell ? These cams like to be in the rev range and having to high a diff ratio wont help.
I have 3.9 at them mo and am going down to a 4.6 when i get the money to buy one but soemthing like a 4.1 would be great for these.
If you can get a light port and polish done and bigger valves put it for your budget then do it.
Luke
A 72-74 is WAY to much cam for "flat-top" 38mm SU's. It will run....like a bucket of p1ss. Get a Wade 25/65 Billet cam, should cost around $230 + $300 installation and tuning.
I have personally driven around a 25/65 38mm SU combo for the last 3 years and I can say with complete confidence that this is an excellent package.
Anything close to a 72-74+ will need bigger carbs. I'm not a big fan of the 40mm webers so go for something like twin 44mm SU's or a 45mm Weber.