will 205/60/15 fit frt of 74 dart without rub?

All depends on the back spacing of the wheel. A 15X7 with 4-1/4" BS will run a 215/60-15 with no problem but if the BS is only 4" then you have problems.... Ask me how I know. If you go 15X8 the max BS you can go is 4-1/2" and a 215/50-15 works fine. A little smaller diameter (23.9 vs 25") but its a good 1-1/2 to 2" wider.