You need to get wwith an eng builder that will work with you as you can source parts from a few places and you want to work with someone who knows the business. Myself I use a 440Source stroker kit crank , rods , pistons and the small parts. Built it myself and its been great for almost 6 years so far. So you see you will get many different opinions. I dont use their heads as I bought Indy EZ heads from Dwayne Porter. So your best bet is to find a good eng person to work with you and I take it to build your eng unless you have done that work. If you have a local person to work with thats good. I bought my heads from Dwayne Porter but I am sure he would build your eng for you also as he sells alot of the parts and knows the best parts to use.
Get with a builder you trust and work with them as you will get alot of different opinions on here and most will be good opinions but we may have your head spinning all over.
Do you have a good local machine shop you can work with ? Unless you can build your own engines I would get with a good builder you can trust and work with them. Ron