Gary I have always used the "rope" seal and never had a problem. I always tried to find old NOS ones so it will still have asbestos in it's construction. Pontiacs and some early Fords worked fine. With a vacuum pump all is forgiven. As for the Dodge it's for a 360 and slightly too big. You also need to polish out the cross hatches on the stock crank for the correct seal making the rope useless.
I believe one of our oldest members Walter Smith #23 uses this on his GMC Modfied in Conneticut. I would cut one short on one side only and leave the second side stock so the split of the seal was not the split of the cap to the block. I do this also with the rope and it's tricky to do...Hey but what do I have but time...........JD
