help with audio

[t300]

Hi all, could use some help from the audio experts. Just got an old Kenwood deck that was in a '72, am/fm cassette with pre-outs. I'd like to get 2 new 4" speakers that I'll mount under the stock dash grill as well as add an amp and sub. I'm thinking an inexpensive powered sub. Will use a FM modulator tied to bluetooth so I can use an ipod for tunes, I understand this should be better sound than the type where you just tune to specific FM station. Is it as simple as that or are there things here that won't work or specific types of speaker or powered sub I need?

Kenwood krc-1007 - https://www.amazon.com/dp/B00005T3OM

was thinking of this powered sub. Kenwood KSC-SW11 https://www.amazon.com/Kenwood-Low-P.../dp/B00VQSDNYU

FM inline modulator - https://www.amazon.com/gp/product/B0...e%22%3EScosche

bluetooth - https://www.amazon.com/Fusion-MS-BT1...+stereo+dongle

Haven't picked out 4" speakers yet.

pictures of deck at end of my thread here
http://67-72chevytrucks.com/vboard/s...d.php?t=591951

Any advice would be appreciated!