(1) engine specs (CID, cam, compression, max RPM, ec.) (2) the projected environment (street, street/strip, race only) (3) the tuner's knowledge and experience (4) availability of tuning parts
In general spread-bore carbs work best for street and street/strip vehicles. They also work well for straight-line race vehicles. However,making a spread-bore work going around corners can be challanging.
The last two items are extremely important. NO carburetor is going to be perfect for a modified engine right out of the box. Someone (the owner, or the tuner) will generally have to modify a carb. Their knowledge of the specific carb, and the availability of parts will play a large role in the success of the installation.
Size will be a factor of the first two items. And remember it is MUCH easier to tune a carb for all-out race than for a high performance street engine!
Jon.
Good carburetion is fuelish hot air Owner, The Carburetor Shop LLC
