From memory you need springs as well.If I went with 3 can I run stock springs or do I need HD springs
I think someone here clarified that recently too.
But, personally, I think it's worth it, as I'de rather have mid to high rpm power, vs power fall off up top.
A spring compressor is cheap too.
Build this thing once, and enjoy it for a long time, even if it takes you a little longer to finish it.