65 Coronet 318 poly 4 speed conversion

I've been lining up parts to switch my 318 3 speed manual 65 Coronet wagon over to a 4 speed. Started thinking this weekend that the bolt pattern is different for 3 speed vs 4 speed and I don't know if that vintage bell housing is drilled for both.

I'm using an early 4 speed so driveshaft and input shaft bearing retainer should be ok. The car is still buried for winter storage, and trying to look at it right now isn't feasible. Thought I should get a jump on locating another bellhousing if needed.

Opinions please; do you think that bellhousing is dual pattern?
Thanks in advance guys.

I'm swapping an auto to 4spd in a 65 BelvedereII wagon and am using a early 70's aluminum bellhousing. The bell I took out of my 66 Coronet wagon poly/3spd was cast iron and heavy. Also I am using a 70 Road Runner 4spd and the original Belvedere driveshaft and yoke.

I recently put a 360 4spd with late model bellhousing in a 66 Dart wagon. Other than the z bar bracket, no problems. A few measurements, cut a bracket and welded on a pivot ball.

any newer sb housing should work.
you will not be able to line up 1 bolt hole on the drivers side. Just throw that one away.

The 1965 3 speed bellhousing is different than a 4 speed bellhousing. You will also have to cut the floor and weld in a 4 speed shift tunnel.

Thanks all! Guess the hunt is on then. You've saved me some wasted time. Thanks again.

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I'm using an early 4 speed so driveshaft and input shaft bearing retainer should be ok.

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When you say early 4 speed do you mean a ball and trunion with the flange on the output? Just asking because that's what's on the three speed.

Frank