Yes, it will clear your firewall, but it might not clear your air cleaner.
When I bought my 68 ElCam it had a 327 with HEI and it cleared just fine. When I replaced it with a 350 and used an MSD HEI, I started having problems with air cleaner clearance. Edelbrock and a bunch of other manufacturers sell a plastic spacer if you're not running a carb spacer.
Proud owner of a 68 ElCam
"Sometimes the only reason to get out of bed in the morning is to wear a new shirt."
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