I found TDC and installed the distributor then found a fuel pump gasket and installed the stock fuel pump I used with the six Tillotsons.
Little trick for finding TDC comp.
First always write your engines firing order on the shop wall and write it with the split.
1843
6572
So you know what cylinder is on the opposite stroke.
For me with the six
153
624
so if 1 is on comp then 6 is on overlap.
To find which one is on comp, put a hose snuggly in the spark plug holes 1, then 6 and blow in each one. One will have no resistance and one will build pressure and that one is the one on compression. Crude, simplistic? Sure. Effective? Absolutley!