I plan on putting in a point-less distributer does this require the peice that connects the distributer to the oil pump to be replaced too, if so am I able to replace this peice later without pulling off the timing cover?

& when I put the timing chain cover on how do I get the seal over the crank shaft gear?

You have to pull the crank pulley before pulling the timing cover off. You'll need a pulley puller. I did a Mallory distributor and it needed no timing cover work at all for a '72 240. Just pull the old distributor and mount the new one. Easy Easy...