Header to idler arm clearance issues
Here's what the BBC brackets looks like:
http://www.rickscamaros.com/product....dept%5Fid=3218
Here's what the SBC brackets look like:
('69 302 or 350)
http://www.rickscamaros.com/product....dept%5Fid=3218
or
(all other SBC)
http://www.rickscamaros.com/product....dept%5Fid=3218


. 