Parts needed and compatibility

JDMopar said
There's more room under the doghouse of a Dodge van with a small block than you would think. It wouldn't be any, if much harder to get the valve springs off than it would to get the head bolts loose.

I don't remember what it looks like under the doghouse but I thought of those rusty exhaust studs/bolts and think it would be wise of me to at least try to do the seals with the heads in place if possible.

67Dart273 said
you are attempting to tackle this yourself

I've talked myself right out of the engine swap. Even disregarding the hassle of the engine R&R it seems like more trouble and/or expense than it's worth.