Ls swap mounting issue

[bruisedbanana79]

Working on my 1985 ls swap (4.8, 4l60e, 208 TC). Used dirty dingo slider mounts and even with the engine pushed back as far as possible in those mounts my transmission crossmember and driveline is about 2.5” pushed forward. Obviously I can shorten the front driveshaft and have a new rear one built but that is costly. Does anyone have any ideas on how I can get the transfer case pushed back more?

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[Rustisbest]

Are the slots not to the rear of the bolts? Looks like it's all the way forward to me.

 

[CalSgt]

Are the slots not to the rear of the bolts? Looks like it's all the way forward to me.

Same

Engine should be almost touching firewall