A handy quick 1/4 mile time calculator
http://www.exoticcarsite.com/1-4_mile_calculator.htm
A tire size comparison calculator
http://www.miata.net/garage/tirecalc.html
A Bolt Pattern Dimension website.. for cars up to 1986
http://www.teufert.net/wheels/bolt-pat.htm
Pretty much any automotive calculator you would need
http://www.wallaceracing.com/Calculators.htm