I can't find my '66 catalog but did locate one from 1968. The Speedifour 85 was 89.5 CID and weighed in at 232 lbs. The smaller block Sportfour was 70.7 CID and weighed 225 lbs.
check out the stuff at the old-omc site lots of info there.i found it hard to read the 66 brochure but the 65 one shows a 90s at approx 242 and 75 hp at approx 240 1/2.