i need help w/duster engine

What ever the existing cam is , is of no importance. The rate of lift on a solid roller is radically different than a flat tappet hydraulic cam. Even if she knew every clearance and spec and how deep the piston is at TDC and the depth of the reliefs (which she doesn't) you still couldn't possibly figure out what kind of clearance she will have with the new cam. Clay is OK if you have a
.100+ inches of clearance but when you are getting down to the thousandths of an inch clay is woefully inaccurate. Is it .065 or .050, you just can't tell with clay and be 100% sure. When you are talking .060 of clearance, you better be damn sure it's .060 and not .048.

Either way I can't take this discussion anymore, some of you understand, some of you will never understand until you learn by experience. So be it. These can be some hard and expensive lessons.