Or, learn from my mistakes.

Photo:

#1] Original 38 firewall

#2] I cut it out to make room for the first engine [SBC],

should have kept it and merely set it back for clearance

#3] Plenty of room now

#4] Made cardboard template

#5] Made sheet metal firewall

#6] Welded it in however, I then discovered that the firewall

was too thin and the doors were sagging!

#7] New firewall, THICKER, this worked well, no more door sagging

#8] Firewall painted [now BBC], done.