The Slant is a unique engine in a lot of ways & overall is very strong but they are very limited by the small bore & resulting small valve sizes , the do respond very well to head porting & milling the head .100 to increase compression & better Cam profiles , I also use the Alum 2bb intake with an adapter & the Holley 500 cfm carb , a low restriction exhaust helps too . I have used the Alum 4bb intakes also both the short & Hyper Pack style . Fuel dist is tough , the carb is so far away from the head so it gets no heat so it runs very poorly in cooler weather .
I have seen them with EFI & blowers , this helps a lot , Efi is very helpful with fuel dist & you can easily run the Hyper Intake & a lrge throttle body . If you decided to go with forced induction with a blower or turbo the engine will really respond as the valve size is small for the displacement so getting air into the engine will increase power dramatically .