I was thinking of putting some 351W heads on my 68-289 for some more power. Can anyone tell me if the Edelbrock RPM manafold that's on my 289 will still fit? What about the headers? Are the exhaust flangs the same?

If anyone has any pro's and cons I would appriciate it. I have a 68-289 with a mild cam (not sure the specs) and Holly 650 on an Edelbrock RPM and unknown heads with flowmaster duels. It just seems like with all of the add-on's it still doesn't have the power I would like.

Other option is just an engine swap but I like the idea of the original engine.

THanks