I installed a used 1977 350 SB 4bm 76,000m stock. swapped aluminum intake manifold, carb, headers, w/ same distributor. I have the #1 cyl on the comp. stroke and timing mark on the 8. The distributor does not go all the down in the correct position facing the #1 signal from the distributor. I can turn it and it will go down but It's not in the correct position. The oil pump seems to ingage (it moves pretty easy) but it does not drop in. Could the problem be the cam position or am I on the right timing mark to drop it in correctly? Word of mouth was to use a pry bar and bump the cam inside where the distributor goes in to engage the distributor correctly.(scarey) or hold down the distributor and bump the ign. until it falls.