The problem you have with the majority of conversions, especially if you have bought it from ebay is how can you gaurentee it is straight?

If you chop the front end out of a sierra and weld it onto the the front of an escort you will find it very hard to keep it all square in both planes.

Really you need to fabricate a simple jig to ensure that the front crossmember mounts are square with the rear beam mounts.