well you have just to look at our advertisement banner you will see. Some of these kits are similar some are not. Their are some price differences between the highest and lowest priced kits. Some will work out deals some wont. All but one listed below has been around for a while and the new company Extreme Effects has been working on their kit well over a year now. The choice is up to you. But please check them all out and email or call them.
Extreme Effects has a area on this form where you can post question directly to them. Steve is the most frequent EE poster
RGR Robert is a MOD on are boards and he can answer question directed to him especially when involving custom work.
RPM's Mikael is a member of this forum and frequent post and will answer your question
http://www.rpm-mustangs.com/ The owner is Mikael and has a good product
http://www.extremeeffect.com The soon to be introduced venom kit is long anticipated Steve is the Customer service Rep he can answer most of your questions
http://www.rpm-mustangs.com/rgrcfm/index.html RGR (Robert Green) is one of the pioneers in the 3.8 community. Does custom P&P work
http://www.moranav6racing.com/ Morana is another one of the pioneers in the 3.8 community.
http://www.supersixmotorsports.com/ Tom has a stable of 3.8 followers with his kits
Ported heads, roller rocker arms, cam lift designed for what you want to do, Intakes, ported and polished, if you want to go all out stroke it and replace the rotating assembly with forged parts, then you can think about a supercharger or turbo.