I have c4 front and rear in my 67 which i believe is the same width as earlier models. I built my own clip for it and although the fabrication was easy it took a lot of setup time in the first place and it has blockhugger headers and a smallblock motor, there is about a quarter of an inch between the header and the upper arm alignment bolts, i laid a steel sheet on the floor and rolled the car over it and set it on jackstands, then tacked some square tube to steel sheet and chassis so it wouldnt move when unbolting parts, then very carefully marked centerlines and wheel centers on plate with a large set square so i knew i would still have clearance for wheels and fenderlips then made up two stands from flat plate like an upside down tee that had the wheel bolt pattern drilled to the vertical face at ride height so i could bolt the c4 hubs to and tacked these down to plate once on alignment marks. then made a small fixture to mount the rad support to and tacked it down to the plate also, these are the main reference points so need to be good , i then mocked up where the steering rack needed to be and tacked a frame down again, then its a case of routing steel between these points, i took anti dive angles etc from a stock vette before starting framework, if i can find any pics of the frame i will post them, hope this helps.
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