Engine questions

[67MustangTiny]

So after looking at the engine in my 67 coupe. I think I’ve finally come to the conclusion it’s a 302/5.0L block from an 86 Mustang, the number on the block is GF296622.
It has the 289 intake manifold and cylinder heads fitted and I’m assuming the 289 camshaft as the firing order is 1-5-4-2-6-3-7–8.
I want to know
1. What are the small threaded holes and non threaded holes in the top of the block used for as there was nothing in them when I removed the intake manifold (pics 1,2,3)
2. Why is there such a large hole at the front of the block by the distributor (pics 4 and 5)
3. What cam, intake and carburettor combo would be a good setup for this car?

I know these are awkward questions but I’ve got no experience with carburettor cars. I’ve done a fair bit of research and landed on the 600cfm Holley double pumper and 600cfm holly street warrior carb. Thanks for the help !

 

[mattbaker302]

it looks to me like those drilled holes were for a roller cam setup, as far as that hole in the block im not sure but it is supposed to be there. id say get the heads ported then throw a performer rpm intake and that carb and sh will have a little pep. if you want more power swap over to a roller cam and gt40 heads, the heads you can get at a pick n pull for 35$ each. they will bolt to the 302 block and will add 30hp ish.

 

[rustaddict]

I would definitely go back to the roller cam.

 

[2Blue2]

#2
That hole is to relieve oil spray to keep distributor / timing chain from seeping.

A good carb choice is the 500cfm or 600cfm Edelbrock. can sit for months and still work fine