I have a brand new m1sc w/ intercooler that I bought in haste of going faster and never got the chance to bolt it on. It is the 12 rib belt with 6lb. pulleys. The kit was for a carbureted HP500. I would think any carbed BBC it should fit. As the title says it is brand new, the plastic bags of parts have never been opened. $4300. pics on request [email protected]