it depends on what block the 1993 heads are from. im thinking they are from the lsx family. and if they are you cannot put them on your 400 the heads just wont fit bolt patterns are wrong and the heads are just a totally different design.
You need to get a Casting # book and look up which heads you have.
Yes it will.
Yes, There the same.
YES it will.
Sure had one a few years back, what problems are you having or what questions do you have i can try and help
Yes.
It would appear to be a 1974- 1980 because the block # comes up as 69-80 on the year range and the heads come up as 74-80. These Heads have a decent valve size (1.94/1.50 76cc Chamber) but are smog style heads and crack easy. Be carefull
no
1978 Chevrolet Big10 pickup
Chevy didn't make a S-10 in 1978.
111"
dont know when they stopped putting lead INTO paint but the use of lead paint in homes was banned in 1978