bb/s would be at 500hp while a stroker or big bore will be around 460. Those numbers would be for 7000rpm setups. 550rw with a high RPM big bore is doable.
We (Apocalypse Performance/TW cams) were approached by Engine Labs online magazine to spec a build for a n/a cobra that would see street and road race duties. The goal was to develop and engine that would run on 93 octane, be very affordable, live a long life and be a hell of a lot of fun to...
aftermarket tensioners are very good, just ensure you use those that are metal.
Aviator engines require you to use the cobra oil pan and front cover. DO NOT use the Aviator intake manifold.
4v and 2v blocks are the same. 4V engines used Romeo, WAP and teskid blocks. 2Vs used WAP, Romeo and Windsor block.
yes, you will need C heads and they are inexpensive
Tips:
I use a small cordless impact to remove the screws, works great
Adding some heat to the plate around the bearing will allow it (bearing) to move more easily
Aftermarket throttle bodies add zero power and offer no other benefits; a serious waste of money.
A turbo system requires and aftermarket K member and coil overs.
your headers and 4.10s gears will have to go.
Do you need forged internals? If staying n/a the answer would be no. An affordable fix would be an engine from a marauder or aviator which have better heads. With you cams it would have more power than your stock engine.
You obviously have no experience with these heads. I've milled them .060" many times and .040" even more and sometimes on boosted engines. There is plenty of meat on these castings to allow for .060" to be removed safely.