Suggestions on performance upgrades for 225

That's a sweet lookin' A100,welcome to FABO !!Most of your questions have been
answered,and a search of this site will turn up many threads on this very subject.We always
direct members who are relatively new to the slantsix.org site,as this is a required stop for
anybody doing almost anything to the beloved slanty.I will throw My 2cents in FWIW;
1)2bbl Yes!, any is better than the single.You're not gonna need a 4bbl w/o cam/valves o/s
2)I would use a large single,single exh. works better on 6's,more flow not req'd w/o^^^^^
3)Definitely optimize the timing setting/total/&curve.
4)Have an O2 bung welded in the headpipe,have someone check&adj./jet w/an A/F meter!
5)Don't OD tranny that poor thing,unless it's got small tires &3.91's,If you overlug the eng.
it won't get better mpg,and will be a dog to boot!Pick the right gears for the job.
IF you get some help,or find you are willing,there are things to do taking the head off,that's
definitely worth the trouble.But it will require someone knowledgeable,and some special
parts, as well as a machine shop familiar/willing to do the job right.