I've got an OLD trw turbo offa combine. Its the same as an old corvair but with std ends rather than with those corvair bolt patterns for carb and exhaust pipe, and its got the correct seal for draw-thru. I believe its an "F" flow .70 a/r. PM me an give me your email and I'll try to send pictures and pricing. I've had it since about 1975 and never used it.