Thank you so much, I have a shop manual from Elanders in Switzerland that has all of the specs. Thanks againif you are just pulling the heads and intake, no. if you have to touch the cam and timing, yes. your 8.1 (gen VII BBC) does not have a traditional distributor, its coil on wire spark technology. the cam sensor and crank sensor are not touched by you pulling the heads.
Correction: I meant to say Elanders publications in Sweden, if you give them the serial number of your engine they will have a workshop manual.Thank you so much, I have a shop manual from Elanders in Switzerland that has all of the specs. Thanks again