Direct Sheetmetal's 37-39 Chevy Firewall is available with a 2" setback for the Small Block Chevy and a 4" setback for the Big Block Chevy.
Direct Sheetmetal kits are made from 16 and 18 gauge, cold-rolled steel and are all hand-formed in their shop.
Each kit contains mounting hardware and an easy-to-understand instruction sheet. Every car or truck is different, so slight trimming and re-shaping of some parts may be necessary to get a correct fit.
(Big Block Chevy firewall pictured).