Can somebody tell me which SEM white to use on interior plastics? They list 4+ whites. Super white, sailcloth white, phantom white, and white. Also, will the Dorman 611-248 lug nut fit the 75 small hole wheels? Has anybody reamed out the smaller holes to equal the 1976 size holes? Lastly, can the Cosworth heater box [with the 90 degree core elbow] be installed without removing the metal blower box on the engine compartment firewall? Non a/c car. Thank you guys.