?? for those who used ECE mounts

[69chevpu]

I am putting an '04 5.3L from a truck into my '67 C10. I have cut the frame for the ECE mounts and drilled the two lower holes. My question for those who have done this is: What set of three holes (upper or lower) did you use when bolting the actual rubber mount bracket onto the lower perch. I know that Murphy will get me no matter which ones I use the first time. It would be nice to have it set the way it needs to be the first time I go to put the engine in.

NOTE: I know someone will respond with "This is worthless without pictures" smilies. If you do that please also tell me how to post pictures. I haven't figured this out yet. I can get pictures onto my computer I just don't know what to do next.

Thanks for all the help guys,
Mel