We did the same frame in a car and it was the flimsiest frame I have ever used. Welded pie cuts into it and tied it into the rockers ever 12", but still could not eliminate the flex at the core support.
Do yourself a little test. Put a set of jack stands at the front of the subrame under the core support and rear rails, then have a 200LB friend step on and off the rocker and watch twist delfection in horror.
I think it is a great piece for a straight line car, but not a G Machine.
JMO
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Frank Serafine
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