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So now I guess my question is can I drill 4 new holes and just mount the adapter plate through the existing backing plate as long as I center the master cyl over the push rod hole in the backing plate and firewall?

yes. If there isn't an adapter(4bolt to 2 bolt) made for this( I do not know B bodies) then center it as you said & drill & you're good.

live every 24 hour block of time like it's your last day on earth