It is very doable , there are lots of us with fentons and standard intake , it just takes a bit of time , maybe a few attempts at the bends , but it does work . Additionally , I encourage you to exhaust heat the manifold , I tried both water heat and exhaust , the latter has been better , more like the factory assist.
I use water to heat my Offy manifold (not standard). I had it both ways also and the Offy was showing signs with exhaust heat. Switched back to water. No problems since'
