I finally installed my new intake manifold on my 305 yesterday. It is the Weiand Action+ with a 2in carb spacer. Wow what a difference the thing makes in throttle responce and power. I swear I gained 25hp over the stock manifold. The thing pulls real hard from about idle to 5200rpm. The only issues I am having with it is that the throttle bracket is not in the right place so the throttle cable is not long enough by 1/2 cm. So the cable puts on the throttle a little so it stays at 1200rpm at idle. I am having a new bracket from JEGS overnighted to me. My other problem is that I developed a massive oil leak somewhere towards the back of the block. I thought it was valve covers, but unforunately it wasn't. I think it might be from the back of the intake, but I thought that any leaks on the manifold would cause a vacuum leak and not spew oil all over? I didn't use the little rubber pieces there, I used a nice bead of black RTV. So what are your thoughts?