Welcome to the forum.
To answer a couple of your questions: No Dolomite ever came with power steering and all the Sprints left the factory with a vinyl roof.
Your biggest worry is going to be rust unless you're handy with a MIG or you know someone who is. The Club do a decent range of replacement panels which is half the battle. You've come to the right place by joining this forum and the Club membership fee is worth every penny so I strongly recommend that you join the club to take advantage of the benefits.
Hope this helps any.
West Yorkshire Area Organiser & forum moderator
Meetings take place on the first Wednesday of the month at 8.00pm at The Old Brickworks, Wakefield Road, Drighlington, Bradford, BD11 1EA
Dolomite 1850 auto (NYE 751L - Waiting for me to give it some love)
Citroën C4 Grand Picasso 2.0 HDi Exclusive (MA08 WCL - the workhorse)
BMW 318i (M265 PNC - Project Bimmer, the 2nd car)
Toyota Celica GT (J481 ONB - the current project car)
Former stable of SAY 414M (1974 Toledo), GRH 244D (1966 1300fwd), CDB 324L (1973 1500fwd), GGN 573J (1971 1500fwd), DCP 625S (1977 Dolomite 1300) & LCG 367N (1975 Dolomite Sprint) plus 5 Acclaims and that's just the Triumphs!
Check my blog at http://triumphtoledo.blogspot.com
"There is only one way to avoid criticsm: do nothing, say nothing and BE nothing."