According my Pontiac Selling Facts dated April 79, the base or standard engine in the Formula was L27 301 2bbl.
The L37 (301 4bbl.) was optional @ $85.00 & included chrome splitter exhaust.
The L80 (Olds 403) was optional at $280.00 & " " " ".
The L78 (W72 400) was optional @ $370.00 & required M21 4 speed & WS6.(splitters incl.)
The LG3 (5.0 chev. 2bbl.) required Calif. emissions & was standard equipment on Formula in that state.
The LMI (5.7 chev. 4 bbl.) was optional @ 155.00 but was High Altitude Emissions (auto trans) ONLY which is likely WHY you haven't come across many/any others.
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