I welded a hole about that big on my dash. If you have a welder you might give that a try. Use a piece of copper as a backer and weld it shut, then grind smooth. (cover all damagable parts including all glass!) You should be able to fix the radio holes by welding and grinding too. When done, you won't even know there was any damage.
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Bob
63 Impala 283/PG/3.36 (under restoration)
66 Impala 327/PG/3.36
66 Chevelle SS 409/M22/3.55
69 Chevelle 307/PG/3.08 (future restoration)
69 C10 short stepside 454/TH350/3.73
69 Custom 30 tow truck 350/4 spd/4.10 (resto done, CRUISIN TIME!)
71 Cheyenne 20 fleetside 350/4 spd/4.10
71 Chevelle 6/PG/3.08
72 Chevelle 454/M21/4.10
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