68 baracuda 340 s

I guess I have to cut the wheel wells after spending many hours and hard earned cash to fix the butcher job done by prevouis owners.I have had extinsive work done on my heads and 1/58 wont couver the ports.Does any one make adapters so I can run tti 1/78 racing head headers our could someone recomend a company that build headers for my situation?