Use Dupli Engine enamel, silver for the trans and, flat black for the engine itself ( it hides imperfections or scratches ), gloss black would bring the scraches out so they could be seen very easily. The motor shouldent need any attention other than cleaning cause it only has 58,000 on it, it may leak a little oil out of the seals but, I say that mainly because the engine is 54 years old. I'd recomend just buying a 350 and sticking it in there with a TH350 slushbox with a lokar nostalgia 23" shifter on the floor. With the old Chevy 6's you have to actully try to blow it up, they wont go pop on there own, specially with only 58,000 so, you could use the 216 in it until you had the money for a 350, just keep in mind that they only have 92 HP and the car is 3100 pounds so, it's gonna be slllllooooowww, not as slow as the automatic model with the 235 but, you'd probably be lucky if you got 75 MPH out of it.