Depends on the type of steering
I have a '79 that was originally tiller steered & the mainsheet was rigged from the end of the boom (double sheave block) to the transom (single sheave block with a cam cleat) The boat was retrofitted with wheel steering and the mainsheet moved to mid-boom, with the sheet running to blocks shackled to pad-eyes on each side of the companionway sliding hatch. I don't like this set-up as it's difficult to sheet the boom in hard (to midships) without putting a lot of down force on the sheet. I'm going back to a double-sheaved block on the end of the boom, with the sheet running to a pad-eye set in the cockpit floor , just ahead of the steering pedestal. Later on I may install a track across the cockpit seats and have the lower block attached to a car running on the track.