I think the idea of the big ( M20?) bolt and large diameter washers was to allow some adjustment of its position in the fibreglass. You drilled the fibreglass oversize, assembled the M20 bolt, washers and nut, then adjusted the position of body against the pivot point in the frame before clamping them up tight.
On Frederics car I just used the bolt through the frame as a pivot point and didnt fit a nut. I drilled it through and put an R clip through the bolt shank on the inside of the chassis pivot tube to stop it sliding out. To remove the front end then you just pulled the R clips, slid the bolts out and lifted away.
I dont recall a lot if effort to get it all lined up but maybe I was just lucky. I had done a fair bit of re-shaping on the front clam so probably got rid of mis-fit there.
If you have enough thread on the M20 bolts you could add washers behind the bolt head to align the clam laterally, then use the pivot bolts as I did.
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