I must have pushed the "add reply" button too quickly. If you have checked all of the 261 posts you should have found the link to the 1955 HRM feature about Frank McGurk's 261/278 project. I would estimate that what you are planning on your 261 should provide another 10 to 20% more power. I had a couple of 261-powered chevrolets (a 1951 coupe and a 1953 2-door) in the late fifties-early sixties that could keep up with most 265 and 283s. my best build used an Isky E-2 cam, three Stromberg 97s, and a milled and ported Coervette six head, and a Corvette six exhaust manifold
Sounds like a great project. Keep us posted
Hoyt, II #922
