[Paul Ceasrine]

Rich B,

Thanks for the follow up.

From what I found in an old Magazine Article.

Part I

The 1958 Bonneville was to be made available with the
* 370/300 HP ~ '3 x 2' Barrel'
* 370/310 HP ~ 'Fuel Injection'

This combination was only to be available with the Bonneville Model.

Featuring;
* 10.5-1 Compression-Ratio Cylinder Heads {65 CC}
* High-Lift Camshaft


Part II

In March 1958, an 'Extra Horsepower' Nascar Certification version of the 370 was available.

Featuring the "Tempest 395-A' code.

PK Option = $233 {Available in all Models}
* 370/315 HP ~ '4-Barrel'
* High-Lift Camshaft ~ {Dealer Installed}

PM Option = $331 {Available in all Models}
* 370/330 HP ~ '3 x 2' Barrel
* Special High-Lift Camshaft ~ {Dealer Installed}
* Special Exhaust Manifolds

The 370/338 HP 'Fuel Injection' must have been an 'over-the-counter' performance add-on.