1994 Lincoln Mark VIII Head Gasket Replacement

Engine is overheating when I use the accelerator - if I idle around, it heats up, but won't overheat. Diagnosed as pushing combustion air into the water jacket when any effort is made to accelerate and cooling system unable to compensate for the extreme heat - NO signs of water coming INTO the oil system. Initial incident came when I left the car running in a hot parking lot - by the time the car was shut off, there was quite a pool of green all around the car. Have only driven very short distances for the past year (since the incident) - less than 50 mi. Total. Ready to replace the head gaskets - I understand that I need to have the heads checked while they're off - but I see some posts on other forums about losing the cam settings (twin cam, 4v system) - what am I up against with that? (No "solution" posts can be found on the other forums.) Also, since I am at 160K, should I be doing other work while I'm in there? Timing belt/chain, etc? I have replaced the water pump, thermostat and alternator in the past year while not driving it. I already purchased the gasket kit -$185. Money is an object, as my daily driver just shot craps with a thrown timing belt. I hope to put enough effort into this job to be able to trust the car for another few years. Very much appreciate experienced input. This is a stock Aluminum head/Aluminum block configuration. OH - and I don't yet own a shop manual - do I go for the $45 "factory" manual, or the $25 Haynes/Chilton. Oh - one more - how about tools? I have quite a few standard tools - will I need specialized tools? I intend to rent a torque wrench from the parts store - and I expect the book will tell me what more I may need - but if you can give me a preview, that would be great! I also have an "engine analyzer" and timing gun from tinkering around back in the 80s - will those be of any value in the work I'm about to undergo?