I thought the only reason they make solid biscuit motor mounts was because a high torque engine tends to rip the rubber biscuit in half on the driver side. The spool mounts basically eliminate this problem, even if all the rubber falls out the engine is still locked in to the k-frame. Is there any other reason for solid motor mounts? Why would you weld a spool mount solid? Is there a performance gain? I don't see how there would be. I thought the reason to go to an engine plate was to re-position the engine and gain header space. Please tell me if I am missing something here, thx.