66 with a 350 tall V.C. hitting the firewall opinions needed

[bo-w]

so here is the situation iv got a 66 with a 350 and it had a 327 intake with center breather, and a 2 barrel carb. i had a nice aluminum intake,4 barrel holley and got some nice aluminum tall valve covers with breathers. intake went on no problem but my drivers side vc is about 1/16 from the firewall and passinger side won't mount , it hits the firewall. so my question is do i "massage" the firewall with a bfh or do you have any other less drastic fixes to my problem? all opinions are welcome . thanks