[51chevytruck]

Be careful How much you lower the cab, it will affect other items such as the clearance between your trans tunnel and cab. This area would have to be modified/cut. I have found the optimum clearance between the distributer and stock firewall to be about an inch. In this position I have about a 1/2 inch clearance between my trans and cab. I fabricated 3/8's plates and bolted those to the frame, then fabricated mounts that placed the engine mount bolts about an inch above the plates. (Hope this doesn't sound too confusing)
The reason I mention this is because there is very little room to play in mounting the eng for and aft especially if you want to run a mechanical fan.

I don't know how high my cab is sitting in relation to my frame I would have to measure but 10.25 sounds about right.