Rocky Rotella wrote a very good article in HPP a few years ago covering all the shakers and their differences. A pic of my 80 TA was used in the article I took, I'll look through the mags for it and post what it says.
VFN makes what looks to be a "early shaker". Glasstek makes a HUGE early shaker. PontiacDude has a larger later shaker as well.
Either VFN or Glasstek can mold their shaker into their Ventura hoods, but its an extra cost. I used a VFN hood and glassed in an early shaker on my car.
HTH
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