Mounts for an A-body Chevelle won't be what you'd need, but some for a first-gen F-body 396 Camaro would do the trick. You should be able to source those from an aftermarket supplier, both the frame mounts that bolt to the crossmember and the engine mounts.
Not sure on the crossmember, but I doubt it would be any different than a TH400 crossmember for a Firebird as the trans sits in the same location, same would go for the TH350/4-speed crossmember.
Fuel lines might already be in the right location, on my '69 Firebird they are on the passenger side and cross over to the driver's side at the front crossmember.
The HEI should fit, they fit when you use a Pontiac engine. If not, there are small-body HEI distributors made off of the small-cap points distributors available out there (PY member SunTuned does them).
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/3.08
2002 WS6 Convertible LS1/4L60E/3.23
1966 VW Type 2 Single Cab Pickup 140hp 2276
1956 VW Type 2 Panel Van 36hp 1200
1957 VW Type 1 Beetle 180hp 2276
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