body mounts,I have a delima

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Ok this truck started life as a long bed and now is a short bed,C-10?.When I got this truck the bed was 3/4 inch higher than the cab I replaced all the sheet metal,bed,doors,fenders,hood and nothing has changed,this chassis had overload springs on the rear which I removed,and someone (PO) torched the hole out where the driveshaft goes thru,To correct the miss alignment I added 3/4 inch of washers welded together to the cab mounts.So I was thinking this frame is a 4 wheel drive or 3/4 ton.So I ordered 4 wheel drive 3/4 ton body mounts and comparing them to the body mounts plus washers they are 1 inch taller.Will these new mounts compress that much.Thanks Jeff