Instead of chasing a Unicorn, get one of the factory 230 hp 9.2:1 cr engines.
'68 & '69 stock 318.
'85 to '91 stock 318 roller engines with the 302 closed chamber heads.
Now you will have a good basis to start with. Both 230 hp engines with 9.2:1 cr.
Single best upgrade is add a 4 barrel and dual exhaust.
(those 8.1 cr engines are way less desirable to try to build upon.)
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