hedman "tight tube" hedders?

a pic from Summit's site...
View attachment hed-78500.jpg

from Hedman's website...
Part Number 78500
Product Name TIGHT TUBE Hedders
Application CHRYSLER,PLYMOUTH VALIANT 1967-1976 273, 318, 340, 360, 361, 383, 400, 426, 440
Auto
Trans. Column YES
Auto
Trans. Floor YES
Manual
Trans. Column YES
Manual
Trans. Floor YES
P/S YES
A/C YES
Head Flange Gasket 27970
Variations 78506,
Related Products Hedder Flange Gaskets - 27970
TIGHT TUBE Hedders - 78506
Application Notes: 1. Without smog injection or injection heads.
13. A-type engine only. (Will fit with in-line port pattern only)
15. Shortie style hedder. Maximum ground clearance.
151. Must use mini starter.
45. Not legal for sale or use in California on pollution controlled motor vehicles.
6. Modification to stock exhaust required to retain catalytic converter.
C. For vehicles 1964 through 1974 without A.I.R. systems, considered as O.E.M. replacement parts when existing emission controls are not removed from vehicle.

I'm starting to believe!!