I use speed master front and roadrunner on the back of my Flash for period look, I run them both on 30 lbs/ft, they must have softer sidewalls than back in the day, running at twenty is downright scary.
On my project I run AM20 rear (Venom) and AM18 front both at 30 also, but it hasn't covered a lot of miles as yet so remains to be seen if that is correct - great tyres though, handles nice