oil out the dipstick

So once again, i was reminded that to assume is to make an *** of you and me.

i took my intake off 3 times because i though it was leaking oil out between the intake and the block by the alternator. Got it back together for the third time a week ago, drive around the block and guess what?! Still oil all over the place. Clean it up and run the throttle by hand and look to see where it is coming from.

It is coming out of the end of the dipstick. It is what i think is a stock dipstick. When I built the 318 for it, i got a new chrome dipstick, but couldn't get the tube in the block (it measures .03 inches larger than the stock tube) so i pulled the one out of the 273 and put it in. There is no rubber at the top, and i dont know if there is supposed to be or not? it is just steel, It fits kind of tight, but seems to be cocked to one side allowing a gap. Whats the deal with these? is there supposed to be some sort of o ring or rubber on the top (new dipstick that i couldn't get in does have rubber around the top)?

thanks

Steve