Yes sir. I have the 4th gen block mount and the spohn frame mounts. It had a SBC in it before. The bolt holes look different. I am going to dig further into it tonight.So you used-
The 4th gen F body block mounts
And the spohn frame mounts
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I had a local guy use this Spohn kit with the TBSS AC pump and truck accessories and it was probably the cleanest setup/method I saw on a budget. He built the car before LS swaps became a craze and the plethora of parts weren't available.
From my understanding the spohn frame mount just replaces the OEM SBC mounts (the rubber ones that bolt to the frame. If your car is a SBC, just mark the 3 of the 4 holes the mount uses and take the frame mount off (the OEM rubber GM mount for a SBC only uses 3 holes, the 4th hangs off the frame), and reuse the same holes.
If your car was a buick V6, olds 307 or something else the SBC holes are there, but have never been used. You should be able to find a picture of what holes each mount style uses and just pick the SBC ones.
You shouldn't have to drill the frame as from my understanding the bolt pattern on these spohn mounts is identical to the standard SBC frame mount used for decades across many GM chassis and all G bodies had the SBC holes there.
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