I'm running a leaded head on my pinto I'm wondering what lap additive I should use and what grade of fuel ie unleaded or super unleaded of if I can't et it at the time 4 star? I can get 4 star at a garage about 30 miles from home so I'd rather not be restricted to just one fuel station

4 star is a lead replacement petrol is it not? So no additive required.

Other than that standard unleaded with a lead replacement additive will be fine.

I used to use Millers VSP which was a lead additive and octane booster combined, it's still available.