+1 on the oven cleaner. If you use Eazy-Off get the blue can, the yellow one has lye. This is what my engine looks after one treatment, and no brushing:
http://www.mightyram50.net/vbulletin...ll=1#post67166

For tires, check tire rack. don't know what size you want, but they seem to have a few to choose from in the 195/70/14 category. Prices are good and shipping is free.
https://www.tirerack.com/tires/TireS...earDiameter=17