The one on the right goes to the TB and the one on the left goes to ISC I believe. I know there is the one that comes from the TB to the ISC, can't tell if it is the one on the left though because it is hanging below the manifold.
Is the #6 were the HG went? Probably got steamed cleaned. The cam in the pic looks to be in pretty good shape, can you get some better pics of the peices and parts?
And yes it looks that they used water instead of coolant.
With a NA you can go as much as 11to1 compression ratio with premium fuel. The only reason you would want to lower it would be if you want to go NA-T. Read some of the stickies about going NA-T or swapping to a GTE. There's a load of info on both.
Yes most will work with you with the parts. They will need them before the can machine anything.
Why are you wanting to drop the compression ratio? Before you order anything the shop should look things over to see what has to be done.
Yes there is some play back and forth, there is a limit...
You need to have a machine shop clearence the bearings, check the head, crank, etc. You can check the rod and main clearences youself to see were they are at now. Easy to do with Plasticgauge. A Haynes or TSRM would show you how. If you don't feel comforable with it it should be done by a shop...
Check to make sure everything is lined up, crank, cam gears, #1 piston on TDC, and rotor pointing at #1 plug wire. Then put a timing light on it with the jumper wire to set the timing.
Possible if you or somebody else had set the head down on the block surface of the head without something under it to keep from sitting it on some extended valves.
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