From the outside, someone tell me what to look for. My friend's 76 k20 pickup is coming together. I jsut put a new rad, heater hoses, and a rearview mirror in it this weekend. I also swapped out the coolant gauge sender. But this freaks me. The sender was in the side of the block, in between the front exhaust ports on the driver's side. The hole in the intake manifold had a plug in it.(the plug accepted a standerd 3/8" ratchet, but it wouldn't budge) When I pulled the original sender out, it was smaller in dia to the new one so I had to also pull out some sort of brass sleeve which looked original. The new sender slipped right in and works fantastic. Is this normal? Every engine I have ever seen has had the coolant senders on the intake, even on my 92 Tbird SC(still for sale, heavily modified), both senders are on the intake. Can any of you educated people tell me if this is truly the 350 the original owner claims it is? The 4 barrel carb is Rochester, but we don't know the model yet. It looks factory(complete with dirt, most everything unhooked). Also, there is a plug on top of the water pump which looks to be plugging the hole hole for the water bypass. Is this normal for this old motor or was something done? Could this possibly be a 305? I'll take another look at it this week and get some more descriptions. Some time before the end of the year a I'm gonna get him to get a compression and leakdown test done. Maybe then we can get a displacement test done as well. FYI: Tranny is a th350, t-case is I think a 205(full time with manual front hubs).