I am not trying to insult your mechanical abilities but did you try and get all the bolts started before tightening any of them down?
I ask because I've seen a very similar situation where someone bolted the K up to the Frame rails and tightened those 4 bolts with it pushed all the way forward and the same bolt holes in the rear were off and wouldn't accept the bolts.
I’ll have to agree, that’s like Rule #1. get all bolts in before tightening them. Also remember the trans mount and crossmember has some adjustment too, it might be helpful, so I’d loosen those bolts if you haven’t already. It may provide the adjustment you need.
I have this k member sitting on my work bench to install this weekend, I bought it after trying to get a racecraft to fit but failing, and I remember being able to move the motor around quite a bit as I needed with those trans bolts loosened.
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