Personally, I'd spend the 150-200.00 more and open up Pandora's box of possibilities....
I've received good service from my Performer RPM's over a number of seasons of active racing as well as dormant seasons...
Lots of room to grow there....I still use mine in as-produced condition...
See this
article on cylinder head flow for more info and comparisons...
IIRC, the Jr's have a dual bolt pattern for headers in case you want to run big tube headers in a racing situation....didn't realize stock-style headers wouldn't work....anyone?
Another option is a set of ported C9-D0 Windsor heads....nice performers with a OEM quality...I used those on my last 302 racing engine with 1.94 and 1.6 Chevy valves...durable performer, operating in the 4-7.5K range.
Read up as much as you can on heads before plunking down your money, both on performance and durability...
I bought my RPM's back in the mid 90's and didn't have access to all this great info...I just lucked out...*G*
Pat
http://www.jps.net/binay/webdocs/strtmstng002_sml.JPG