I have a pair of nice 920s in the attic I think the chambers were 58CC but it has been a long time and going strictly by memory on that. Maybe I could find some cheap 1.6 or 1.7 shaft rockers and a long runner MPI intake for LA heads... better yet could I buy a TBI with 8 injectors and just extend the existing wires to pulse them? I really think TBI is the best for an MPG project, the last mass produced engine sold in the USA with TBI got 50+ MPG.