Thanks for the replies so far, everyone. We finally got the chance to put the car up on a lift this morning, and found the casting number. Looks like the engine is a '71. Casting number is 481988 with code YX. Now - time for mods. The guys at the shop we use are big Edelbrock supporters, so we've been looking at a new carb, intake manifold, and air cleaner to start. This may be a dumb question, but are these generally "universal" parts? Edelbrock's website makes no mention of specific carbs for different engines. Another question regarding the carb - the stock carb for the '71 YX engine was a 2 barrel. The Edelbrock (looking at the 600 CFM with electric choke) is a 4 barrel. Are these compatible? What changes will need to be made to accomodate this?